Ajax如何传输Json和xml数据
程序员文章站
2022-11-22 20:24:54
ajax传输xml数据：只要把数据封装成xml格式就可以实现传输，前台js用responsexml接收xml参数，后台读取用流和dom4j来解析
前台页面
&l...
ajax传输xml数据：只要把数据封装成xml格式就可以实现传输，前台js用responsexml接收xml参数，后台读取用流和dom4j来解析
前台页面
<%@ page language="java" import="java.util.*" pageencoding="utf-8"%>
<%@taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>
<!doctype html public "-//w3c//dtd html 4.01 transitional//en">
<html>
<head>
<title>ajax xml数据处理演示</title>
<script type="text/javascript">
//get方式ajax
function send1(){
alert("ok");
var name=document.getelementsbyname("name")[0].value;
var age=document.getelementsbyname("age")[0].value;
var xhr=null;
if(window.xmlhttprequest){
xhr=new xmlhttprequest();
}else{
xhr=new activexobject("microsoft.xmlhttp");
}
var url="<c:url value='/xmlservlet?name='/>"+name+"&age="+age;
//3设置访问方式
xhr.open("get", url, true);
//4设置访问成功返回后的操作
xhr.onreadystatechange=function(){
if(xhr.readystate==4){//返回
if(xhr.status==200){//响应代码正常
var txt=xhr.responsetext;
alert(txt);
}
}
};
xhr.send(null);
}
</script>
<!-- 前台以xml的格式向服务器发送数据 -->
<script type="text/javascript">
//post方式ajax
function send2(){
alert("222");
//1创建ajax对象
var xhr = null;
if(window.xmlhttprequest){//高版本
xhr = new xmlhttprequest();
}else{//低版本
xhr = new activexobject("microsoft.xmlhttp");
}
//2请求地址
var url = "<c:url value='/xmlservlet'/>";
//3设置访问方式
xhr.open("post", url, true);
//4设置访问成功返回后的操作
xhr.onreadystatechange=function(){
if(xhr.readystate==4){//返回
if(xhr.status==200){//响应代码正常
var xmlobj=xhr.responsexml;
var users=xmlobj.getelementsbytagname("user");
for(var i=0;i<users.length;i++){
var id=users[i].getattribute("id");
var name=users[i].childnodes[0].firstchild.data;//xml中的dom模型中的操作方法，和html中有点小差别
var age=users[i].childnodes[1].firstchild.data;//不能用childnodes["age"]
alert(id+","+name+","+age);
}
}
}
};
var name=document.getelementsbyname("name")[0].value;
var age=document.getelementsbyname("age")[0].value;
var xml="<user><name>"+name+"</name><age>"+age+"</age></user>";
xhr.send(xml);
}
</script>
</head>
<body>
name:
<input type="text" name="name">
<br /> age:
<input type="text" name="age">
<br />
<input type="button" value="get提交" onclick="send1();" />
<br />
<input type="button" value="post提交" onclick="send2()" />
<br />
</body>
</html>
后台页面
<%@ page language="java" import="java.util.*" pageencoding="utf-8"%>
<%@taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>
<!doctype html public "-//w3c//dtd html 4.01 transitional//en">
<html>
<head>
<title>ajax xml数据处理演示</title>
<script type="text/javascript">
//get方式ajax
function send1(){
alert("ok");
var name=document.getelementsbyname("name")[0].value;
var age=document.getelementsbyname("age")[0].value;
var xhr=null;
if(window.xmlhttprequest){
xhr=new xmlhttprequest();
}else{
xhr=new activexobject("microsoft.xmlhttp");
}
var url="<c:url value='/xmlservlet?name='/>"+name+"&age="+age;
//3设置访问方式
xhr.open("get", url, true);
//4设置访问成功返回后的操作
xhr.onreadystatechange=function(){
if(xhr.readystate==4){//返回
if(xhr.status==200){//响应代码正常
var txt=xhr.responsetext;
alert(txt);
}
}
};
xhr.send(null);
}
</script>
<!-- 前台以xml的格式向服务器发送数据 -->
<script type="text/javascript">
//post方式ajax
function send2(){
alert("222");
//1创建ajax对象
var xhr = null;
if(window.xmlhttprequest){//高版本
xhr = new xmlhttprequest();
}else{//低版本
xhr = new activexobject("microsoft.xmlhttp");
}
//2请求地址
var url = "<c:url value='/xmlservlet'/>";
//3设置访问方式
xhr.open("post", url, true);
//4设置访问成功返回后的操作
xhr.onreadystatechange=function(){
if(xhr.readystate==4){//返回
if(xhr.status==200){//响应代码正常
var xmlobj=xhr.responsexml;
var users=xmlobj.getelementsbytagname("user");
for(var i=0;i<users.length;i++){
var id=users[i].getattribute("id");
var name=users[i].childnodes[0].firstchild.data;//xml中的dom模型中的操作方法，和html中有点小差别
var age=users[i].childnodes[1].firstchild.data;//不能用childnodes["age"]
alert(id+","+name+","+age);
}
}
}
};
var name=document.getelementsbyname("name")[0].value;
var age=document.getelementsbyname("age")[0].value;
var xml="<user><name>"+name+"</name><age>"+age+"</age></user>";
xhr.send(xml);
}
</script>
</head>
<body>
name:
<input type="text" name="name">
<br /> age:
<input type="text" name="age">
<br />
<input type="button" value="get提交" onclick="send1();" />
<br />
<input type="button" value="post提交" onclick="send2()" />
<br />
</body>
</html>
--------------------------------------------------------------------------------
ajax传输json数据的要点利用apache或者阿里巴巴的jsonarray类进行传输
前台代码
<%@ page language="java" import="java.util.*" pageencoding="utf-8"%>
<%@taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>
<!doctype html public "-//w3c//dtd html 4.01 transitional//en">
<html>
<head>
<title>ajax json数据处理演示</title>
<script type="text/javascript">
function ask1() {
//1创建ajax对象
var xhr = null;
if (window.xmlhttprequest) {//高版本
xhr = new xmlhttprequest();
} else {//低版本
xhr = new activexobject("microsoft.xmlhttp");
}
//2请求地址
var url = "<c:url value='/jsonservlet1'/>";
//3设置访问方式
xhr.open("post", url, true);
//4设置访问成功返回后的操作
xhr.onreadystatechange = function() {
if (xhr.readystate == 4) {//返回
if (xhr.status == 200) {//响应代码正常
//※※※※※解析后台返回的json串
//js中eval()方法的功能：是校验参数文本串符合js中哪一种数据类型，并把其转换成对应类型的对象
var txt = xhr.responsetext;
var users = eval("(" + txt + ")"); //把符合json格式的文本串 转换成 json对象
for ( var i = 0; i < users.length; i++) {
alert(users[i].id + "," + users[i].name + ","
+ users[i].age);
}
}
}
};
//5 发送
xhr.send(null);
}
function ask2() {
//1创建ajax对象
var xhr = null;
if (window.xmlhttprequest) {//高版本
xhr = new xmlhttprequest();
} else {//低版本
xhr = new activexobject("microsoft.xmlhttp");
}
//2请求地址
var url = "<c:url value='/jsonservlet2'/>";
//3设置访问方式
xhr.open("post", url, true);
//4设置访问成功返回后的操作
xhr.onreadystatechange = function() {
if (xhr.readystate == 4) {//返回
if (xhr.status == 200) {//响应代码正常
//※※※※※解析后台返回的json串
//js中eval()方法的功能：是校验参数文本串符合js中哪一种数据类型，并把其转换成对应类型的对象
var txt = xhr.responsetext;
//alert(txt);
//把符合json格式的文本串 转换成 json对象
var users = eval("(" + txt + ")");
for ( var key in users)//map的便利方式
alert("属性：" + key + ",值：" + users[key]);
}
//for ( var i = 0; i < users.length; i++) {//list的遍历方式
//alert(users[i].id +","+users[i].name+","+users[i].age);
//}
};
};
//5 发送
xhr.send(null);
}
function ask3() {
//1创建ajax对象
var xhr = null;
if (window.xmlhttprequest) {//高版本
xhr = new xmlhttprequest();
} else {//低版本
xhr = new activexobject("microsoft.xmlhttp");
}
//2请求地址
var url = "<c:url value='/jsonservlet2'/>";
//3设置访问方式
xhr.open("post", url, true);
//4设置访问成功返回后的操作
xhr.onreadystatechange = function() {
if (xhr.readystate == 4) {//返回
if (xhr.status == 200) {//响应代码正常
//※※※※※解析后台返回的json串
//js中eval()方法的功能：是校验参数文本串符合js中哪一种数据类型，并把其转换成对应类型的对象
var txt = xhr.responsetext;
//alert(txt);
//把符合json格式的文本串 转换成 json对象
var users = eval("(" + txt + ")");
for ( var key in users)//map的便利方式
alert("属性：" + key + ",值：" + users[key]);
}
//for ( var i = 0; i < users.length; i++) {//list的遍历方式
//alert(users[i].id +","+users[i].name+","+users[i].age);
//}
};
};
//5 发送
xhr.send(null);
}
</script>
</head>
<body>
<input type="button" onclick="ask1();" value="ajax请求后台数据(手动封装json方式)" />
<br />
<input type="button" onclick="ask2();"
value="ajax请求后台数据(用apache工具封装json方式)" />
<input type="button" onclick="ask3()" value="ajax请求后台数据(用fastjson工具封装json方式)" />
</body>
</html>
jsonservlet1.java
package cn.hncu.servlet;
import java.io.ioexception;
import java.io.printwriter;
import java.util.arraylist;
import java.util.list;
import javax.servlet.servletexception;
import javax.servlet.http.httpservlet;
import javax.servlet.http.httpservletrequest;
import javax.servlet.http.httpservletresponse;
import cn.hncu.domain.user;
public class jsonservlet1 extends httpservlet {
public void doget(httpservletrequest request, httpservletresponse response)
throws servletexception, ioexception {
dopost(request, response);
}
public void dopost(httpservletrequest request, httpservletresponse response)
throws servletexception, ioexception {
//调用后台service.dao.query()，到数据库当中把信息读取出来
//为简化知识点的理解，此处后台部分的功能直接模拟
response.setcontenttype("text/html;charset=utf-8");
printwriter out = response.getwriter();
list<user> users = new arraylist<user>();
users.add(new user("a001","jack",20));
users.add(new user("a002","rose",22));
users.add(new user("b001","张三",20));
users.add(new user("b002","李四",30));
string json="";
//用java封装出json格式的字符串：[{name:"jack",age:25}, {...}, {...} ]
for(user u:users){
if(json.equals("")){
json="{name:\""+u.getname()+"\",id:\""+u.getid()+"\",age:"+u.getage()+"}";
}else{
json = json +",{ name:\""+u.getname()+"\",id:\""+u.getid()+"\",age:"+u.getage()+"}" ;
}
}
json="["+json+"]";
out.print(json);
}
}
jsonservlet2.java
package cn.hncu.servlet;
import java.io.ioexception;
import java.io.printwriter;
import java.util.arraylist;
import java.util.hashmap;
import java.util.list;
import java.util.map;
import javax.servlet.servletexception;
import javax.servlet.http.httpservlet;
import javax.servlet.http.httpservletrequest;
import javax.servlet.http.httpservletresponse;
import cn.hncu.domain.user;
import net.sf.json.jsonarray;
import net.sf.json.jsonobject;
public class jsonservlet2 extends httpservlet {
public void dopost(httpservletrequest request, httpservletresponse response)
throws servletexception, ioexception {
response.setcontenttype("text/html;charset=utf-8");
printwriter out = response.getwriter();
list<user> users = new arraylist<user>();
users.add(new user("a001","jack",20));
users.add(new user("a002","rose",22));
users.add(new user("b001","张三",20));
users.add(new user("b002","李四",30));
string strjson=com.alibaba.fastjson.jsonarray.tojsonstring(users);
system.out.println(strjson);
//用fastjson工具(只有一个jar包)帮我们把list转换成json串
map<string, object> map = new hashmap<string, object>();
map.put("addr", "湖南");
map.put("height", "170");
map.put("marry", "no");
map.put("user", new user("a003","小李",25));
string strmap=com.alibaba.fastjson.jsonarray.tojsonstring(map);
out.print(strmap.tostring());
}
}
jsonservlet3.java
package cn.hncu.servlet;
import java.io.ioexception;
import java.io.printwriter;
import java.util.arraylist;
import java.util.hashmap;
import java.util.list;
import java.util.map;
import javax.servlet.servletexception;
import javax.servlet.http.httpservlet;
import javax.servlet.http.httpservletrequest;
import javax.servlet.http.httpservletresponse;
import net.sf.json.jsonarray;
import net.sf.json.jsonobject;
import cn.hncu.domain.user;
public class jsonservlet3 extends httpservlet {
public void dopost(httpservletrequest request, httpservletresponse response)
throws servletexception, ioexception {
response.setcontenttype("text/html;charset=utf-8");
printwriter out = response.getwriter();
list<user> users = new arraylist<user>();
users.add(new user("a001","jack",20));
users.add(new user("a002","rose",22));
users.add(new user("b001","张三",20));
users.add(new user("b002","李四",30));
//用fastjson工具(只有一个jar包)帮我们把list转换成json串
jsonarray json=jsonarray.fromobject(users);
string strjson=json.tostring();
system.out.println(strjson);
map<string, object> map = new hashmap<string, object>();
map.put("addr", "湖南");
map.put("height", "170");
map.put("marry", "no");
map.put("user", new user("a003","小李",25));
jsonobject obj = jsonobject.fromobject(map);
system.out.println(obj.tostring());
out.print(obj.tostring());
}
}
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持。